WO2012062397A1

WO2012062397A1 - Battery with a cell assembly

Info

Publication number: WO2012062397A1
Application number: PCT/EP2011/005183
Authority: WO
Inventors: Norbert Bachmann; Jens Meintschel; Martin Righi; Denis Thate
Original assignee: Daimler Ag
Priority date: 2010-11-10
Filing date: 2011-10-15
Publication date: 2012-05-18
Also published as: DE102010050998A1

Abstract

A battery comprises a cell assembly (1) which has a plurality of individual cells (2) that are interconnected in parallel and/or in series. Each terminal of an individual cell (2) is connected to an arrester lug (3) in an electrically conducting manner. According to the invention, at least two arrester lugs (3) can be connected in an electrically conducting manner to an electrically conducting contact element (4) by means of a force- and/or form-fitting connection, the contact element (4) being arranged in a support unit (5).

Description

Battery with a cell group

The invention relates to a battery with a cell assembly according to the preamble of patent claim 1.

Flat, rectangular storage elements for electrical energy such as single cells and capacitors are known from the prior art. In this case, an electrochemically active content of these memory elements is surrounded by a film-like and electrically insulating packaging, through which the electrically conductive

Connections that are designed as sheet-metal arrester elements, are feasible. One pole of the single cell is electrically conductively connected to one arrester element each and forms a pole contact of the single cell.

Such a trained single cell is commonly referred to as Pouch- or Coffeebag- cell. To form a battery and in particular a high-voltage battery, the respective arrester elements of a plurality of such individual cells are electrically conductively connected to one another and interconnected in series and / or in parallel. In this case, the multiplicity of individual cells are arranged next to one another to form a cell composite, which is provided with cooling and optionally with an electronic cell

Switching arrangement provided and arranged in a battery case.

Furthermore, it is known and customary to connect the arrester elements of the individual cells arranged next to one another in the cell assembly by means of a welded connection in a material-locking and electrically conductive manner. For this purpose, known welding methods, such as an ultrasonic, laser, and / or a resistance pressure welding used. As an alternative to the cohesive welding methods, clinching methods ("toxins") can be deduced from the prior art, by means of which the arrester elements of the individual cells arranged next to one another in the cell assembly are electrically conductively connected to one another In this compression, the two arrester elements are plastically deformed and at least one of the two arrester elements is formed a recess for forming a non-positive and positive connection.

Based on this prior art, it is an object of the invention to provide an improved battery, in particular, a safe production and safe use of the battery is possible.

Advantageous embodiments of the invention are the subject of the dependent claims.

A battery has a cell network comprising a plurality of parallel and / or series-connected single cells. One pole of every single cell is with one

Ableitfahne electrically conductive connected. According to the invention, at least two conductor tabs with an electrically conductive one are used for interconnecting the individual cells

Contact element by means of a positive and / or positive connection electrically conductively connectable, wherein the contact element is arranged in a carrier unit.

In the battery according to the invention, the Ableitfahnen are indirectly by the

Contact element electrically conductively connected, which are arranged within the electrically insulating carrier unit. This is a contact of a person with the

live contact elements of the particular designed as a high-voltage battery battery largely excluded. This reduces the risk of personal injury caused by electrocution in the manufacture, assembly and use of the battery, particularly in a motor vehicle.

Likewise, a direct connection of the two Ableiterfahnen by means of a welding or Durchsetzfügeverfahrens is avoided in the battery according to the invention. This eliminates occurring during the welding or the clinching material resulting material and / or material subsidence in the material of the two welded or arranged Ableiterfahnen and the resulting uneven surfaces, the one

Reduce heat transfer to cool the battery. The planing tabs are in a particularly simple manner with the contact element electrically conductive non-positively and / or positively connected.

Expediently, the carrier unit is formed from an upper carrier plate and a lower carrier plate, between which the contact element is non-positively and / or positively held. Due to the design of the carrier unit from an upper and lower carrier plate, the assembly and production of the positive and / or non-positive

Connection of carrier unit and contact element particularly easy.

In one possible embodiment, the upper carrier plate has a multiplicity of bulges and the contact element has a multiplicity of indentations corresponding to the bulges, the bulges engaging positively and / or positively in the indentations. This allows easy installation and secure positive and / or non-positive connection.

The live contact element is by means of a clamping unit with the two Ableitfahnen two adjacent individual cells together force and / or

positively connected. In this case, the clamping unit comprises at least one clamping jaw and a clamping element, wherein the clamping jaw serves as an abutment for the non-positive and / or positive connection between the contact element and Ableiterfahne. By means of the clamping unit, the arrester lugs, the contact element and the clamping jaw are wedged or pressed together according to the wedge principle. The clamping jaw can be arranged together with the contact element in the carrier unit such that the force and / or positive connection of the elements to be connected takes place with a sufficiently large pressing force.

The carrier element is arranged laterally and in particular on the upper side on the cell assembly formed by the individual cells such that the clamping element, which is designed for example as a screw, is easily accessible for easy attachment and / or release of the non-positive and positive connection from the outside.

Preferably, the clamping jaw is made of electrically and thermally conductive material and in particular of a metal. Thus, the pressed together by means of non-positive and / or positive connection with each other parts comprising the clamping jaw, the contact element and the Ableiterfahnen are formed of high strength material, so that the compression of these parts can be done with a large pressing force to a high-quality force - And / or form fit to achieve. Advantageously, the at least two discharge lugs are electrically and thermally conductively connected to the clamping jaw, so that the clamping jaw in addition to

Contact element conducts a current between the individual cells. An arrangement of a conventional electrically insulating element, such as an electrically insulating and thermally conductive heat conducting in the field of non-positive and / or positive connection is eliminated. As a result of the design, a risk of a short circuit is reduced because a press fit of the positive and / or positive connection arranged, relatively soft heat-conducting foil is easily damaged during the pressing. In particular, a raised spot of the arrester lug, which is caused by welding, is easily pushed through the material of the heat-conducting foil during the positive and / or positive-locking pressing.

The clamping jaw is thermally conductively connected to a cooling plate, so that a heat generated within the individual cell can be dissipated to the cooling plate. In this case, sufficient cooling of the individual cells during operation, charging and discharging of the battery is ensured.

Preferably, the cooling plate is arranged on the edge side in the carrier unit and

bounded in particular laterally by a boundary web and a separating web of the electrically insulating carrier unit. As a result, the electrical insulation of the cooling plate is ensured and additionally optimally utilized an available space.

Between the clamping jaw and the cooling plate is the thermally conductive and electrically insulating Wärmeleitfolie outside the press association of the force and / or

arranged positive connection to electrically decouple the cooling plate of the live clamping jaw. This ensures a good thermal coupling to the cooling plate while avoiding short circuits.

Appropriately, the area of the press association of the force and / or

form-fitting connection with a corrosion inhibitor to provide good electrical and thermal conductivity between the Ableiterfahne and the

Contact element and / or between the Ableiterfahne and the clamping jaw

sure. For this purpose, a coating, such as a nickel, tin, and / or gold coating, provided at the respective contact points of the non-positively and positively to be joined parts as a corrosion inhibitor. It is also conceivable that a Ingress of moisture to the contact points by applying and / or introducing a paint, a potting compound, silicone and / or contact grease is prevented.

It is particularly advantageous if a multiplicity of contact elements and clamping jaws are arranged in a common, electrically insulating carrier unit, in order to enable a simple and cost-efficient production of the battery.

The battery according to the invention is particularly suitable for use as a primary or alternative storage unit of a drive unit of a motor vehicle. In particular, the battery is suitable for use in an electric or hybrid vehicle.

Embodiments of the invention are explained in more detail below with reference to drawings.

Showing:

1 schematically shows a perspective view of two individual cells, wherein in each case one arrester lug of the two individual cells is connected to a contact element by means of a non-positive and / or positive connection and the contact element is arranged in a carrier unit,

Fig. 2 shows schematically an exploded view of a

upper and lower carrier plate, between which a cooling plate, a heat conducting foil and an arrangement of clamping jaws and contact elements are arranged,

3 is a schematic exploded view of an upper and lower carrier plate, between which a cooling plate, a heat conducting foil and an arrangement of clamping jaws and contact elements are arranged,

Fig. 4 shows schematically a plan view of an arrangement of single cells to a

Cell network, wherein arrester lugs of adjoining individual cells are connected in pairs indirectly by a contact element, Fig. 5 shows schematically a longitudinal section showing a section of a

Cell composite of interconnected single cells shows and

Fig. 6 shows schematically a cross-sectional view showing a section of a

Cell composite with a laterally arranged carrier unit shows.

Corresponding parts are provided in all figures with the same reference numerals.

The terms "right", "left", "top" or "bottom" refer only to the embodiment of the invention shown in the respective figure and are only for simplicity of description. The names are in no way limiting.

Figures 1 to 6 show an embodiment of the invention, in which a battery comprises a cell assembly 1, which comprises at least two parallel and / or series-connected single cells 2.

The individual cells 2 are formed in accordance with the already described flat Coffeebag construction, in which the individual cell 2 has a foil-like and electrically insulating shell, which after evacuation in the peripheral edge region by means of a

Welding is closed. Two sheet-shaped and electrically conductive

Ableiterfahnen 3 are performed by the film-like shell and connected to one pole of the single cell 2 electrically conductive.

It is in a manner not shown within the single cell 2 a

Electrode stack electrochemically active, juxtaposed stacked and separated by a separator films arranged, each one pole contact of one polarity, each with a Ableiterfahne 3 is connected to form the pole of the single cell 2 electrically conductive.

To form the cell compound 1, at least two single cells 2, as shown particularly in Figure 1 ^', arranged side by side and parallel to each other. The upper side of the respective film-like shell of the single cell 2 protruding Ableiterfahnen 3 are connected to an electrically and thermally conductive contact element 4, which is made in particular of metal. In this case, the at least two juxtaposed individual cells 2 of the

Cell composite 1 by means of the contact element 4 both parallel and in series interconnected. The electrically and thermally conductive connection between a respective Ableiterfahne 3 of the two adjacent individual cells 2 and the contact element 4 is by means of a force and / or positive connection to

formed connecting parts. For this purpose, the contact element 4 is in an electrical

insulating support unit 5, which is made in particular of a plastic material, arranged.

The carrier unit 5 comprises a lower carrier plate 5.1 and an upper carrier plate 5.2. In Figure 1, the contact element 4 is disposed below the upper support plate 5.2.

The contact element 4 and in particular a plurality of contact elements 4, as shown in Figures 2 and 3, is in the intermediate region between the lower and upper

Support plate 5.1, 5.2 can be arranged such that the contact element 4 to the upper

Support plate 5.2 adjacent. In order to at least limit a relative displacement of the contact element 4 and the upper support plate 5.2, a recess 4.1 is formed on the contact element 4, in which engages a formed on the upper support plate 5.2 and correspondingly formed bulge 5.2.1.

For non-positive and / or positive connection between contact element 4 and

Ableiterfahne 3, the battery has a clamping unit 6, which includes a clamping jaw 6.1 and a clamping element 6.2, which is designed in particular as a screw, rivets or spring clip. The clamping jaw 6.1 has, as shown for example in Figure 2, a substantially trough-shaped shape and has, as in particular in the

Longitudinal sectional view of Figure 5 can be seen, a U-shaped cross section. The longitudinal sectional view of Figure 5 is perpendicular to the parallel arranged individual cells 2 of the cell assembly 1 along a longitudinal section shown in Figure 4. In the plan view of Figure 4 is for better representation of the clamping units 6 the

Carrier unit 5 shown only schematically by dashed lines.

In each case two discharge lugs 3 of adjacent single cells 2 of the

Cell composite 1 are in pairs, as shown in particular in the plan view of Figure 4, with the respective contact element 4 non-positively and / or positively connected.

The clamping jaw 6.1 and in particular a plurality of clamping jaws 6.1, as shown in the exploded view of Figures 2 and 3, is within the carrier unit 5 and in particular between the lower support plate 5.1 and the upper support plate 5.2 of the support unit 1 can be arranged. In this case, the clamping jaw 6.1 in the lower support plate 5.1 can be inserted such that the substantially channel-shaped clamping jaw 6.1 runs parallel to the individual cells 2 of the cell assembly 1. Figure 1 shows a lower support plate 5.1, in which a contact element 4 is inserted. For receiving the clamping jaw 6.1, the lower support plate 5.1 a groove-shaped recess 5.1.1 with corresponding inner dimensions to hold the jaw 6.1. This is shown in particular in the exploded perspective view of Figure 2 from above and in the exploded perspective view of Figure 3 from below.

Furthermore, the lower support plate 5.1 an elongated recess 5.1.2, through which the sheet-shaped Ableiterfahne 3 one of the individual cells 2 can be passed. The conducted Ableiterfahne 3 is carried out by the inserted into the support plate 5.1 jaw 6.1. For this purpose, the clamping jaw 6.1 a slot 6.1.1 is formed such that the Ableiterfahne 3 through lower support plate 5.1 and 6.1 clamping jaw is passed and inside, as shown in Figure 5, on a first oblique side edge 6.1.2 of the jaw 6.1 and a second sloping side edge 4.2 of the contact element 4 is present.

The lead-out tab 3 passed between clamping jaw 6.1 and contact element 4 non-positively and / or positively clamped. For this purpose, designed as a screw clamping element 6.2 from above through the upper support plate 5.2 and the contact element 4 can be guided and screwed into the clamping jaw 6.1. Accordingly, the upper support plate 5.2 5.2.2 a first bore 5.2.2 in the bulge 5.2.1, the contact element 4, a second bore 4.3 in the region of the recess 4.1 and the clamping jaw 6.1, a third bore 6.1.3 for receiving the clamping element formed 6.2.

The screwing of the running as a screw clamping element 6.2 in the third bore 6.1.3 of the clamping jaw 6.1 causes a first clamping force F, which is directed substantially along a surface normal of the support unit 5. The first and second oblique side edges 4.2, 6.1.2 act like a wedge, so that a part of the first clamping force F is redirected and a second clamping force F 'is generated, perpendicular to the between the first oblique side edge 6.1.2 and the second inclined side edge 4.2 arranged Ableiterfahne 3 acts. By means of the force and / or positive connection between the clamping jaw 6.1, contact element 4 and Ableiterfahne 3 is an electrically and thermally conductive connection between these parts ensured.

The clamping jaw 6.1 is in particular made of metal, so that in addition to the respective contact elements 4, a current can be conducted between the individual cells 2 by means of the clamping jaws 6.1.

The Ableiterfahne 3 is clamped by means of the clamping unit 6 with the contact element 4 such that also Ableiterfahnen 3 different lengths electrically and thermally conductive with the respective contact elements 4 and the respective

Clamping jaws 6.1 are connectable. The respective arrester lugs are 3

different length in the carrier unit 5 can be inserted and performed by the elongated recess 5.1.2 and the slot 6.1.1, so that the non-positive and / or positive connection between the clamping jaw 6.1, contact element 4 and

Ableiterfahne 3 ensures a good electrical and thermal coupling of the connected parts 3, 4, 6.1 even with a variable insertion depth of the Ableitfahnen 3. The non-positive and / or positive connection according to the wedge principle thus tolerates

Ableitfahnen 3 different lengths, so that in particular the non-positively and / or positively connected parts 3, 4, 6.1 can be arranged within the carrier unit 5.

To improve the thermal and electrical conductivity and to prevent corrosion damage the arrester lug 3 in the field of form and / or

cohesive compound provided in a manner not shown with a coating, which consists in particular of nickel, tin or gold. In addition, penetration of moisture by the introduction of contact grease, paint coatings, silicone and / or potting compound in the region of the slot 6.1.1 or the elongated recess 5.1.2 in the interior of the carrier unit 5 can be prevented.

In order to cool the battery, a thermally conductive cooling plate 7, as best seen in FIGS. 2 and 3, is arranged on the edge side within the carrier unit 5. The cooling plate 7 can be inserted into the upper support plate 5.2 edge side and laterally limited between a divider 5.2.3 and a boundary web 5.2.4 of the upper support plate 5.2. Here, the divider 5.2.3 is used for electrical insulation of the cooling plate 7 and contact element. 4

The cooling plate 7 is coupled thermally conductively to the clamping jaw 6.1. For this purpose, the clamping jaw 6.1 is a web 6.1.4 integrally formed on the edge, the cooling plate 7 on the underside supported. In the intermediate region between web 6.1.4 and cooling plate 7, an electrically insulating and thermally conductive heat conducting film 8 is arranged, which consists in particular of a plastic material, so that a risk of short circuit is at least reduced. By means of the thermally conductive connection between clamping jaw 6.1 and

Cooling plate 7, a resulting in the interior of the single cell 2 heat to the cooling plate 7 can be derived.

The cooling plate 7 can be flowed through by a coolant. For this purpose, the cooling plate 7 on a plurality of inner cooling channels 7.1, which extend perpendicular to the individual cells 2 of the cell assembly 1 and lead the coolant. This is best in one

Cross-sectional view seen in Figure 6, wherein the course of the illustrated

Cross-section VI is shown in Figure 4.

LIST OF REFERENCE NUMBERS

cell assembly

single cell

conductor lug

contact element

.1 indentation

.2 second sloping side flank

.3 second hole

support unit

.1 lower support plate

.1.1 channel-shaped depression

.1.2 oblong recess

.2 upper support plate

.2.1 bulge

.2.2 first hole

.2.3 Divider

.2.4 Boundary bridge

6 clamping unit

6.1 clamping jaw

6.1.1 slot

6.1.2 first sloping side flank

6.1.3 third hole

6.1.4 Bridge

6.2 Clamping element

7 cooling plate

7.1 inner cooling channel

8 heat-conducting foil

F first clamping force

F 'second clamping force

V longitudinal section

VI cross section

Claims

claims

1. Battery with a cell assembly (1), comprising a plurality of parallel and / or series-connected single cells (2), wherein a pole of a single cell (2) is electrically conductively connected to a Ableiterfahne (3),

characterized in that

for interconnecting the individual cells (2) at least two Ableiterfahnen (3) with an electrically and thermally conductive contact element (4) by means of a positive and / or positive connection electrically and thermally conductive are connectable, wherein the contact element (4) in an electrically insulating carrier unit (5) is arranged.

2. Battery according to claim 1,

characterized in that

the carrier unit (5) consists of an upper carrier plate (5.2) and a lower one

Support plate (5.1) is formed, between which the contact element (4) is held non-positively and / or positively.

3. Battery according to claim 2,

characterized in that

the upper support plate (5.2) a plurality of bulges (5.2.1) and the contact element (4) a plurality of to the bulges (5.2.1)

having corresponding indentations (4.1), wherein the

Bulges (5.2.1) engage in the indentations (4.1) non-positively and / or positively.

4. Battery according to claim 1,

characterized in that for force and / or positive connection between the at least two Ableiterfahnen (3) and the contact element (4) at least one clamping unit (6) is provided, the at least one clamping jaw (6.1) and at least one

Clamping element (6.2) includes.

5. Battery according to claim 4,

characterized in that

the clamping jaw (6.1) in the carrier unit (5) is arranged.

6. Battery according to claim 4 or 5,

characterized in that

the clamping jaw (6.1) is made of electrically and thermally conductive material and the at least two Ableiterfahnen (3) with the clamping jaw (6.1) are electrically and thermally conductive connected.

7. Battery according to claim 6,

characterized in that

the clamping jaw (6.1) is thermally conductively connected to a cooling plate (7).

8. Battery according to claim 7,

characterized in that

the cooling plate (7) at the edge in the carrier unit (5) of a

Limiting web (5.2.4) and a divider (5.2.3) is limited.

9. Battery according to claim 7 or 8,

characterized in that

for the thermal connection between clamping jaw (6.1) and cooling plate (7), the clamping jaw (6.1) has a web (6.1.4) and between the clamping jaw (6.1) and the cooling plate (7) a thermally conductive and electrically insulating

Heat conducting foil (8) is arranged.

10. Battery according to claim 1 or 6,

characterized in that

in the field of non-positive and / or positive connection between the

Ableiterfahne (3) and the contact element (4) and / or in the region of

non-positive and / or positive connection between the Ableiterfahne (3) and the clamping jaw (6.1) a corrosion inhibitor is arranged.

1 1. A battery according to any one of claims 4 to 10,

characterized in that

between the upper support plate (5.2) and the lower support plate (5.1) a plurality of mutually parallel contact elements (4) is arranged, which are inserted in a plurality of mutually parallel clamping jaws (6.1) and the clamping element (6.2) by upper support plate (5.2) and contact element (4) can be passed, so that the clamping element (6.2) engages in the clamping jaw (6.1).

12. Use of a battery according to one of the preceding claims in one

Motor vehicle.